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The setting is completely meaningless, as WithoutRA= and UseDelegatedPrefix=
in [DHCPv6] section, and DHCPv6Client= in [IPv6AcceptRA] section control
the behavior.
Previously, when a downstream appears which requests delegated prefix to
be assigned, then possibly restart all DHCPv6 clients for another
interfaces.
This makes networkd always honor the UseDelegatedPrefix= setting, and
not restart DHCPv6 clients.
Previously, the prefix delegation is enabled when at least one
downstream interfaces request it. But, when the DHCPv6 client on the
upstream interface is configured, some downstream interfaces may not
exist yet, nor have .network file assigned.
Also, if a system has thousands of interfaces, then the previous logic
introduce O(n^2) search.
This makes the prefix delegation is always enabled, except when it is
explicitly disabled. Hopefully, that should not break anything, as the
DHCPv6 server should ignore the prefix delegation request if the server
do not have any prefix to delegate.
When a .network file is updated but its change is not so big, it is not
necessary to first drop all configs and then reassign later again.
This slightly optimize such situation. First foreignize all configs, and
then drop later when it is not requested by the updated .network file.
Apparently memory sanitizer doesn't grok getdents64() properly. Let's
address that by explicitly marken memory initialized by getdents64() as
unpoisoned.
That way we have a single syscall only for it, instead of the multiple
readdir() and friends do. And we can operate entirely on the stack, no
malloc() implicit.
We already have a similar loop twice, let's make it easier to read via
an iteration macro.
(The new macro is a bit more careful even, as it verifies the full
dirent fits into the remaining buffer when returning it)
That way we can fail earlier if the specified fd is not actually a
directory.
(Also, it's not exactly according to standards to open things without
either O_RDONLY/O_RDWR...)
Collecting coverage causes a significant slowdown in general, but since
this test requires certain timing, we need to tweak the defaults to make
it reliably pass.
Talking to external daemons we ourselves maintain is a job for the
integration tests, not the unit tests. This communication is likely to
fail hence don#t even bother.
This makes our tests a bit cleaner.
Let's move things around a bit, and open /proc/self/mountinfo if needed
inside of bind_remount_one_with_mountinfo(). That way bind_remount_one()
can become a superthin inline wrapper around
bind_remount_one_with_mountinfo(). Main benefit is that we don't even
have to open /p/s/mi in case mount_setattr() actually worked for us.
